Concateneting multi mp4 media onto a single surface

[nbourdin]

Hello,
Is there any way to concatenate multiple mp4 media ​​from server and display them onto a single surface as a big one media (with one timeline in the controller)?

[andrewlewis]

There isn't an easy way to do this, but it is possible. Giving detailed guidance is beyond the scope of this tracker. Here are some pointers that may be useful:

• If it's a requirement to show both videos on the same Surface instance, I think you will need to have the video decoders output to off-screen SurfaceTextures then take care of compositing them onto the final Surface in the right places yourself. There is some information in Mix couple videos #6617. See also the gldemo which shows how to render video to a SurfaceTexture and process the output using GLES.
• You could use two separate player instances, and keep them synchronized (either roughly synchronizing by playing/pausing as needed, or by using the same MediaClock instance for both players). Or you could try merging the two MP4s using MergingMediaSource (I think durations need to match for that), and then customize track selection like Simplify/allow selection of multiple renderers of the same type in DefaultTrackSelector. #6589 (comment) to have multiple renderers of the same time (that comment relates to audio not video but it should be similar for video).

[nbourdin]

Thanks for you answer,
But if i understand well, your solution is for display 2 videos in the same time (which i need to do too in a second case).
My question was about the concatenation (not merging) of 2 videos on the same window and in the same concatenated timeline .
So basically , if I have 1 video of 30s and 1 video of 15s, my progress bar in the control view can reach 45s in the same window.

[andrewlewis]

Sorry for the confusion. Please see #5093 but note the caveat in #4727.